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<a name="boost.proto.env"></a><div class="titlepage"></div>
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<h2><span class="refentrytitle">Struct template env</span></h2>
<p>boost::proto::env</p>
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<h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
<div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: &lt;<a class="link" href="../../proto/reference.html#header.boost.proto.transform.env_hpp" title="Header &lt;boost/proto/transform/env.hpp&gt;">boost/proto/transform/env.hpp</a>&gt;

</span><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Key<span class="special">,</span> <span class="keyword">typename</span> Value<span class="special">,</span> <span class="keyword">typename</span> Env <span class="special">=</span> <a class="link" href="empty_env.html" title="Struct empty_env">proto::empty_env</a><span class="special">&gt;</span> 
<span class="keyword">struct</span> <a class="link" href="env.html" title="Struct template env">env</a> <span class="special">{</span>
  <span class="comment">// <a class="link" href="env.html#boost.proto.envconstruct-copy-destruct">construct/copy/destruct</a></span>
  <span class="keyword">explicit</span> <a class="link" href="env.html#idp91206384-bb"><span class="identifier">env</span></a><span class="special">(</span><span class="identifier">Value</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">,</span> <span class="identifier">Env</span> <span class="keyword">const</span> <span class="special">&amp;</span> <span class="special">=</span> <span class="identifier">Env</span><span class="special">(</span><span class="special">)</span><span class="special">)</span><span class="special">;</span>

  <span class="comment">// <a class="link" href="env.html#idp91209344-bb">public member functions</a></span>
  <em class="replaceable"><code><span class="identifier">see</span><span class="special">-</span><span class="identifier">below</span></code></em> <a class="link" href="env.html#idp91209632-bb"><span class="keyword">operator</span><span class="special">[</span><span class="special">]</span></a><span class="special">(</span><em class="replaceable"><code><span class="identifier">see</span><span class="special">-</span><span class="identifier">below</span></code></em><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
<span class="special">}</span><span class="special">;</span></pre></div>
<div class="refsect1">
<a name="idp142982512"></a><h2>Description</h2>
<div class="refsect2">
<a name="idp142982720"></a><h3>
<a name="boost.proto.envconstruct-copy-destruct"></a><code class="computeroutput">env</code> 
        public
       construct/copy/destruct</h3>
<div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem">
<pre class="literallayout"><span class="keyword">explicit</span> <a name="idp91206384-bb"></a><span class="identifier">env</span><span class="special">(</span><span class="identifier">Value</span> <span class="keyword">const</span> <span class="special">&amp;</span> value<span class="special">,</span> <span class="identifier">Env</span> <span class="keyword">const</span> <span class="special">&amp;</span> other <span class="special">=</span> <span class="identifier">Env</span><span class="special">(</span><span class="special">)</span><span class="special">)</span><span class="special">;</span></pre>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
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<td><p><span class="term">Parameters:</span></p></td>
<td><div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><code class="computeroutput">other</code></span></p></td>
<td><p>
                Another key/value store.
              </p></td>
</tr>
<tr>
<td><p><span class="term"><code class="computeroutput">value</code></span></p></td>
<td><p>
                The value to be associated with the <code class="computeroutput">Key</code>.
              </p></td>
</tr>
</tbody>
</table></div></td>
</tr></tbody>
</table></div>
</li></ol></div>
</div>
<div class="refsect2">
<a name="idp142992016"></a><h3>
<a name="idp91209344-bb"></a><code class="computeroutput">env</code> public member functions</h3>
<div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem">
<pre class="literallayout"><em class="replaceable"><code><span class="identifier">see</span><span class="special">-</span><span class="identifier">below</span></code></em> <a name="idp91209632-bb"></a><span class="keyword">operator</span><span class="special">[</span><span class="special">]</span><span class="special">(</span><em class="replaceable"><code><span class="identifier">see</span><span class="special">-</span><span class="identifier">below</span></code></em><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
<p>
                If called with an object that is implicitly convertible to type <code class="computeroutput">Key</code>,
                this function returns the <code class="computeroutput">Value</code> passed to the constructor. Otherwise, it returns
                the result of calling <code class="computeroutput">operator[]</code> on the <code class="computeroutput">Env</code> passed to
                the constructor.
              </p>
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<td align="right"><div class="copyright-footer">Copyright &#169; 2008 Eric Niebler<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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